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NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
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Revision V1.30
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RS-485 Auto Direction Mode (AUD)
Another option function of RS-485 controllers is RS-485 auto direction control function. The RS-485
driver control is implemented using the RTS control signal from an asynchronous serial port to enable
the RS-485 driver. The RTS line is connected to the RS-485 driver enable such that setting the RTS
line to high (logic 1) enables the RS-485 driver. Setting the RTS line to low (logic 0) puts the driver into
the tri-state condition. User can setting LEV_RTS(UA_MCR[9]) to change the RTS driving level.